Abstract: A transaction system for coordinating processing of a transaction payment request associated with a transaction between a consumer and a merchant, the transaction associated with the merchant providing a product to the consumer, the system comprising: a computer processor coupled to a memory, wherein the computer processor is programmed to coordinate processing of the transaction payment request by: receiving the transaction payment request including consumer code data and identification information pertaining to the merchant and the product, the consumer code data representative of a subaccount registered with a transaction interface, the subaccount associated with a main account also registered with the transaction interface, such that a financial account is common to both the subaccount and the main account; accessing the subaccount or main account using the consumer code data to obtain payment information related to the transaction payment request including the financial account, mobile device contact inf